I currently use a (rooted) Nexus S as my media player using Voodoo sound to take advantage of the Wolfson WM8994 DAC and Sennheiser HD205 headphones. My files are either flac files stored on the phone or 320kbps mp3s streamed from Google Music via Wifi or 3g
For most non-audiophile mobile devices it is probably good advice to keep the nominal impedance in the lower 10-50 ?. The reason is that they are OK in delivering some current but start to clip fairly soon if higher voltages are required (what one needs to drive a higher impedance) since there are limited by their battery voltages. Hence a good balance or to use the right term "impedance matching" between driver (source) and headphones (sink) is key to use the full potential of your combo.
The two things I would recon if you really want to purchase new headphones would be to get the THD down to something 0.1% or even better.
In addition to that, I found the player to make the biggest difference of all.
No, the player makes almost no difference, beyond allow EQ and similar DSP style effects. Indeed, when using lossless files like flac, if two players have any difference at all (with EQ off), one of them is probably doing something questionable.
Those THD numbers are essentially meaningless, so you should not pay attention to them. Even if they were not, THD depends on the dampening factor used to drive the headphones, so without specifying it, you can't know if the numbers are particularly good or bad.
That is true only for a systems where ASIO drivers or some soft ASIO wrapper or WASAPI (exclusive ) is used as the output options.
For example the build-in equalizer settings depending on the load where for the Galaxy first generation this threshold was about 200 ? where the internal “optimizes” the audio output accordingly. The only way to completely circumvent this is to use the new usb audio protocol and us an external DAC - not even rooting will cure all the problems since this is hardware specific.
But one thing for sure, your audio signal will be modified through any of these smartphone players since the phone has this default build in and customer demand this since bass is all people care about and is there way to evaluate the quality of audio is seems ;-) !
Although it is good to close in by comparing them on paper first otherwise you will be lost to the sales person which can be a very dangerous situation ;-)
No, like I said, they don't mean anything. No sense even reading them. Its just a waste of time.
QuoteNo, like I said, they don't mean anything. No sense even reading them. Its just a waste of time.Despite the fact that you have just used exactly these values to show me that my arguments were wrong
I am respecting your opinion.
Don't ask me to match since I was just using my ears.
That's the Wolfson DAC in the nexus S and the Galaxy S I and some version of III. Voodoo sound is an app to make better use of it since the standard Samsung software apparently doesn't do much with it. Needs root access though.
@xTobix I have Jellybean 4.1, haven't had a chance to test the USB audio for myself yet but I've heard (on here amongst others) the USB port tends to not be as good for audio as it's used for so many things at once noise tends to get introduced more easily than a pure digital out.
Quote from: db579 on 02 August, 2012, 10:04:31 AMThat's the Wolfson DAC in the nexus S and the Galaxy S I and some version of III. Voodoo sound is an app to make better use of it since the standard Samsung software apparently doesn't do much with it. Needs root access though.Voodoo sound gives you direct access to the internal equalizer of the wolfson DAC in Samsung Phones. You can SEE that it is not bass boosted from the factory. Hope supercurio can get it working for the U.S. version of the S-III which does not come with a wolfson
However, xTobis has a reason for his fears. Apparently the automotive industry does ship cars with heavy EQ baked into the hardware of car audio players,
But as far as I know this is untrue for smartphones so far. Probably due to Apple's influence on audio quality in that market with their amazing iPhone.
Yes I'm aware USB is a digital out. What I'm saying is that is not the port's only function regardless of whether it is being used for that or not (the port also powers the device while playing in some configurations for example). I have not tested this but several other members on this forum seem to think that USB is rarely well isolated whereas S/PDIF typically is.
This is the app I'm talking about http://project-voodoo.org/android-apps . Curious what others think?
Are you aware that the degree of "isolation" is completely irrelevant for a digital out?
Quote from: saratoga on 02 August, 2012, 04:02:20 PMAre you aware that the degree of "isolation" is completely irrelevant for a digital out?To be honest no not really. I asked a question based involving this in this thread: http://www.hydrogenaudio.org/forums/index....showtopic=96272
and from that and this forum http://www.hifi-forum.de/viewthread-211-338.html (also posted in previous thread)
@stephan_g I appreciate you trying to clarify but some of that has gone a little over my head. Why does USB have a ground loop and toslink doesn't. When you say galvanic isolation you mean preventing current from flowing from the audio producing parts to other parts of the system and vice versa?